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Equity and Remuneration to Shareholders - Summary of Shares used in Calculation of Basic Profit and Diluted Earnings per Share (Detail) - shares
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Earnings per share [line items]      
Number of shares outstanding 1,458,191,883 1,258,280,936 1,258,280,936
Common shares [member]      
Earnings per share [line items]      
Common shares already paid up 420,764,708 420,764,708 420,764,708
Common shares to be paid up 66,849,505    
Shares in treasury (69) (69) (69)
Number of shares outstanding 487,614,144 420,764,639 420,764,639
Preference shares [member]      
Earnings per share [line items]      
Common shares already paid up 838,076,946 838,076,946 838,076,946
Common shares to be paid up 133,061,442    
Shares in treasury (560,649) (560,649) (560,649)
Number of shares outstanding 970,577,739 837,516,297 837,516,297